Laura, who played Alison opposite Simon Bird in the Inbetweeners movie this summer, will be taking on the role of a servant called Beryl in Upstairs Downstairs, which was originally a hit in the 70s, but was reprised for three episodes last year.

The 26-year-old actress spoke of her delight at landing the role, saying: ‘I am so excited to be joining Upstairs Downstairs.

‘It really is a dream come true. I loved the first series and when I found out I was going to be part of the second I couldn’t have been happier.’She added: ‘My character Beryl Ballard is a really spirited modern young woman and all set to shake things up in the house. I can’t wait to play her.’

Haddock joins American actor Michael Landes (New Tricks and Hotel Babylon), who will be playing Casper Landry in the new series, as well as Alex Kingston and Kenneth Cranham.